CN104554439A - Dial pointer-type dynamic display method and rollover warning dynamic display method - Google Patents

Abstract

The invention discloses a dial pointer-type dynamic display method and a rollover warning dynamic display method. All indication regions are dynamically changed according to vehicle speed, and the position of a pointer shows the state of a driver to operate a steering wheel, is changed along with the change of the steering angle of a vehicle, and is used for predicting and reflecting the dynamic change process of the rollover angle of the vehicle. A whole driving process is dynamically displayed by the method in a simple instrument manner, and the state of the driver can be evaluated when the driven does not reach a warning state, and the evaluation on the state of the driver is a positive reference for the driver; when the driver reaches the warning state, warning has a correct indication function for the driver, so that the driver can clearly know how to relieve the warning; through the full-process dynamic display method, the driver is promoted to raise a good driving habit, and the goal of safe driving is achieved.

Description

A kind of hand of dial formula dynamic display method and rollover early warning dynamic display method

Technical field

The present invention relates to a kind of hand of dial formula dynamic display method and rollover early warning dynamic display method.

Background technology

Present its each indicating area of hand of dial formula display method is generally distinguished with color, and the scope in its each region is fixing, cannot realize the situation of change of indicating area during the correlation parameter change of indicated value.

In addition, now because rollover accident causes a lot of cataphoretic failure, sometimes even injuring the safety of chaufeur and passenger, is the major issue of traffic safety and vehicle safety field of research.Along with the development of vehicle sensors, for state of motion of vehicle identification provides actv. perceptual signal, prevention before car accident is played an important role.Existing rollover forewarn system generally only can be reminded chaufeur with the form of sound or light in precarious position, but can not judge driver status at driving procedure, and when chaufeur reaches alert status, chaufeur can not be indicated how to operate and could remove early warning, so that traditional early warning not only can not play correct indicative function to chaufeur sometimes, also can play certain interference effect to chaufeur.

Summary of the invention

The object of this invention is to provide a kind of hand of dial formula dynamic display method, to solve the problem that changes when existing fixing indicating mode cannot realize the correlation parameter change of indicating area with indicated value, provide a kind of rollover early warning dynamic display method adopting the method simultaneously.

In order to realize above object, the technical solution adopted in the present invention is: a kind of hand of dial formula dynamic display method, comprise fan-shaped display disc and the pointer of correspondence, described display disc is provided with the indicating area of different colours, and the scope in each region changes along with the change of the relevant parameter of this dial plate place system.

The technical scheme of hand of dial formula rollover early warning dynamic display method of the present invention is as follows: comprise fan-shaped display disc and the pointer of correspondence, the indicating positions of described pointer is the instantaneous value at Vehicular turn angle, described display disc is provided with the indicating area of the different colours being used to indicate safe driving and at least one-level rollover early warning, and the scope in each region changes along with the change of the speed of a motor vehicle.

The computing formula of rollover prewarning area boundary angles r is as follows:

I, vehicle lateral acceleration a _yalong with vehicle velocity V and Vehicular turn angle θ change and change, concrete formula is:

$a_y=\frac{V^2}{R}=\frac{\mathrm{\π}{V}^2}{180L}*\mathrm{\θ}$

Wherein, L is vehicle wheelbase;

The computing formula of II, vehicle static rollover lateral acceleration critical value is:

$\left|A_y\right|=\frac{B}{2h}*g$

Wherein, h---vehicle's center of gravity height, g---acceleration due to gravity, B is car gage;

III, calculate its dynamically rollover lateral acceleration critical value according to vehicle static rollover lateral acceleration critical value and then obtain the early warning threshold value θ at Vehicular turn angle _threshold, its computing formula is as follows:

Wherein, M is correction, and this value is relevant to vehicle type; K is warning level parameter;

IV, according to rollover early warning threshold value θ _thresholdcalculate rollover prewarning area boundary angles r, its computing formula is as follows:

Wherein, k is display setting parameter.

The computing formula of Vehicular turn angle instantaneous value is as follows:

$\mathrm{\θ}=\frac{L}{B}*\frac{\mathrm{\Δ\ω}}{V}*\frac{180}{\mathrm{\π}}$

Wherein, L is vehicle wheelbase, and B is car gage, and Δ ω is that wheel speed is poor, and V is the speed of a motor vehicle.

The centre choosing fan-shaped display disc is 0deg, the Vehicular turn angle right side be on the occasion of, be left negative value.

Hand of dial formula dynamic display method of the present invention and rollover early warning dynamic display method, each indicating area is according to speed of a motor vehicle dynamic change, the position of pointer then shows the state of pilot control bearing circle, follow the change of vehicle deflection angle and change, predict and reflect the dynamic changing process at vehicle side inclination angle.The method with simple meter type, the whole driving procedure of Dynamic Announce, not reaching alert status at chaufeur can assess driver status, is a kind of reference actively to chaufeur; When chaufeur reaches alert status, a correct indicative function can be had to chaufeur, make chaufeur can know how to remove early warning.By the method for overall process Dynamic Announce, impel chaufeur to cultivate good driving habit, arrive the object of safe driving.

Rollover early warning dynamic display method of the present invention, for conventional method, has following advantage:

(1) overall process driving condition assessment, the method can show vehicle running state and operation state in the whole driving conditions of vehicle, and all the driving condition of chaufeur is shown from whole process, more intuitively, more humane reaching prevent from turning on one's side, the object of safe early warning;

(2) not only can carry out early warning to chaufeur in advance at dangerous situation, the chaufeur that makes that can also be clearer and more definite is understood how can remove early warning, the chaufeur without understanding system also can easily be used.

Accompanying drawing explanation

Fig. 1 is vehicle quasistatic rollover schematic diagram;

Fig. 2 is the interactive interface schematic diagram for early warning of turning on one's side.

Detailed description of the invention

Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.

The invention provides a kind of hand of dial formula dynamic display method, comprise fan-shaped display disc and the pointer of correspondence, described display disc is provided with the indicating area of different colours, and the scope in each region changes along with the change of the relevant parameter of this dial plate place system.

Above-mentioned dynamic display method is applied to vehicle early warning instruction field, then present invention also offers a kind of hand of dial formula rollover early warning dynamic display method, comprise fan-shaped display disc and the pointer of correspondence, the indicating positions of described pointer is the instantaneous value at Vehicular turn angle, display disc is provided with the indicating area of the different colours being used to indicate safe driving and at least one-level rollover early warning, and the scope in each region changes along with the change of the speed of a motor vehicle.

The present embodiment shows prealarming process by the mode of sector pattern instruments, is mainly divided into two parts, fan-shaped dial plate and pointer.Here two-stage early warning is adopted, then fan-shaped dial plate interface is divided into three parts, be respectively green, yellow, red sector territory, three parts represent safe driving, elementary early warning (one-level early warning), serious early warning (secondary early warning) respectively, and three regions are dynamic changes, mainly change according to the speed of a motor vehicle, the position of pointer then shows the state of pilot control bearing circle, follow the change of vehicle corner and change, predict and reflect the dynamic changing process at vehicle side inclination angle.

The computing formula of rollover prewarning area boundary angles r is as follows:

I, vehicle lateral acceleration a _yalong with vehicle velocity V and wheel steering angle vehicle rotational angle theta change and change, concrete formula is:

$a_y=\frac{V^2}{R}=\frac{\mathrm{\π}{V}^2}{180L}*\mathrm{\θ}$

Wherein, L is vehicle wheelbase;

II, as shown in Figure 1, the computing formula of vehicle static rollover lateral acceleration critical value is:

$\left|A_y\right|=\frac{B}{2h}*g$

Wherein, h---vehicle's center of gravity height, g---acceleration due to gravity, B is car gage;

III, calculate its dynamically rollover lateral acceleration critical value according to vehicle static rollover lateral acceleration critical value and then obtain the early warning threshold value θ at Vehicular turn angle _threshold, its computing formula is as follows:

Wherein, M is correction, and this value is relevant to vehicle type; K is warning level parameter;

IV, according to rollover early warning threshold value θ _thresholdcalculate rollover prewarning area boundary angles r, its computing formula is as follows:

Wherein, k is display setting parameter.

The centre that the present embodiment chooses fan-shaped display disc is 0deg, the Vehicular turn angle right side be on the occasion of, be left negative value.

In addition, estimate vehicle running state, by the calculating of geometric relationship, the computing formula of Vehicular turn angle θ instantaneous value is as follows:

Wheel steering angle δ ≈ L/R, then Turning radius R ≈ L/ δ,

Again because, so, have

Wherein, ω _infor Vehicular turn inboard wheel wheel speed (unit km/h), ω _outwardfor Vehicular turn outboard wheels wheel speed (unit km/h);

It can thus be appreciated that: $\mathrm{\δ}=\frac{L}{B}*\frac{\mathrm{\Δ\ω}}{V}$

$\mathrm{\θ}=\mathrm{\δ}*\frac{180}{\mathrm{\π}}=\frac{L}{B}*\frac{\mathrm{\Δ\ω}}{V}*\frac{180}{\mathrm{\π}}$

Wherein, δ is the radian value at Vehicular turn angle, and L is vehicle wheelbase, and B is car gage, and Δ ω is that wheel speed is poor, and V is the speed of a motor vehicle.

Be described with a concrete example below: choose certain passenger vehicle, known axes is apart from L=6.25m, wheelspan B=2.06m, height of center of mass h=1.15m, correction M=0.5 (being provided by automobile theory), substitutes into the rollover threshold calculations formula at Vehicular turn angle by above-mentioned value:

Calculating can draw,

Then regional edge dividing value r=± k θ in rollover early warning interface _threshold, k is display setting parameter, the positive and negative deflecting direction representing vehicle here.

It is 0deg that the present embodiment gets fan-shaped centre, and both sides total angle is 140deg (each 70 degree of every limit, is described with situation below), chooses display setting parameter k=2.5, (green boundary) K when making one-level early warning ₁=0.3, now border is r ₁; (yellow border) K during secondary early warning ₂=0.5, now border is r ₂.

When the speed of a motor vehicle is 100km/h (passenger vehicle Maximum speed limit value), can be calculated by above-mentioned formula:

θ _threshold=2.037*K

Now, r ₁=2.037*K ₁* k=1.53, r ₂=2.037*K ₂* k=2.55.

When the speed of a motor vehicle is 20km/h (from during this speed of a motor vehicle prealarming process), can be calculated by above-mentioned formula:

θ _threshold=50.919*K,

Now, r ₁=50.919*K ₁* k=38.19, r ₂=50.919*K ₂* k=63.65.

Left side scope is like this equally, as shown in Figure 2, so according to above-mentioned computing value, when the speed of a motor vehicle is 100km/h (passenger vehicle Maximum speed limit value), middle security region is (-1.53,1.53) continuum between, one-level early warning is (-2.55 ,-1.53), (1.53,2.55) interval between, secondary early warning be (-70 ,-2.55, interval between (2.55,70); When the speed of a motor vehicle is 20km/h (from during this speed of a motor vehicle prealarming process), middle security region is (-38.19,38.19) continuum between, one-level early warning is (-63.65,-38.19) interval, between (38.19,63.65), secondary early warning is (-70,-63.65) interval, between (63.65,70).

Said process just carries out calculated example to two special operation conditions, and during actual condition, system can automatic calculated threshold, and dynamic change interface and pointer position.

In driving procedure, this early warning interface dynamic change always, the drive manner of chaufeur can be guided intuitively: when Vehicular turn, the Vehicular turn angle of vehicle and the speed of a motor vehicle of correspondence reach rollover threshold value, this inclination forewarn system just can remind chaufeur with the form such as sound, vibrations, the interactive interface of early warning of simultaneously turning on one's side continues Dynamic Announce vehicle running state and operation state, direct drivers safe driving.When vehicle sends early warning, chaufeur corrects driver behavior in time, takes slowly to turn to, recovers steering wheel angle and can automatically terminate early warning to the measure such as zero-bit, deceleration, to avoid the generation of rollover accident.

Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.

Claims (5)

1. a hand of dial formula dynamic display method, is characterized in that: comprise fan-shaped display disc and the pointer of correspondence, described display disc is provided with the indicating area of different colours, and the scope in each region changes along with the change of the relevant parameter of this dial plate place system.

2. a hand of dial formula rollover early warning dynamic display method, it is characterized in that: comprise fan-shaped display disc and the pointer of correspondence, the indicating positions of described pointer is the instantaneous value at Vehicular turn angle, described display disc is provided with the indicating area of the different colours being used to indicate safe driving and at least one-level rollover early warning, and the scope in each region changes along with the change of the speed of a motor vehicle.

3. hand of dial formula rollover early warning dynamic display method according to claim 2, is characterized in that, the computing formula of rollover prewarning area boundary angles r is as follows:

I, vehicle lateral acceleration a _yalong with vehicle velocity V and Vehicular turn angle θ change and change, concrete formula is:

$a_y=\frac{V^2}{R}=\frac{{\mathrm{\πV}}^2}{180L}*\mathrm{\θ}$

Wherein, L is vehicle wheelbase;

The computing formula of II, vehicle static rollover lateral acceleration critical value is:

$\left|A_y\right|=\frac{B}{2h}*g$

Wherein, h---vehicle's center of gravity height, g---acceleration due to gravity, B is car gage;

III, calculate its dynamically rollover lateral acceleration critical value according to vehicle static rollover lateral acceleration critical value and then obtain the early warning threshold value θ at Vehicular turn angle _threshold, its computing formula is as follows:

Wherein, M is correction, and this value is relevant to vehicle type; K is warning level parameter;

IV, according to rollover early warning threshold value θ _thresholdcalculate rollover prewarning area boundary angles r, its computing formula is as follows:

Wherein, k is display setting parameter.

4. the hand of dial formula rollover early warning dynamic display method according to Claims 2 or 3, is characterized in that: the computing formula of Vehicular turn angle instantaneous value is as follows:

$\mathrm{\θ}=\frac{L}{B}*\frac{\mathrm{\Δ\ω}}{V}*\frac{180}{\mathrm{\π}}$

Wherein, L is vehicle wheelbase, and B is car gage, and Δ ω is that wheel speed is poor, and V is the speed of a motor vehicle.

5. hand of dial formula according to claim 4 rollover early warning dynamic display method, is characterized in that: the centre choosing fan-shaped display disc is 0deg, the Vehicular turn angle right side be on the occasion of, be left negative value.